I ran into a bug using Entity Framework Core on Azure Functions. It was easy to avoid once I knew what the problem was, but I had a tough time finding it because it doesn't have much exposure yet.

Jumping to the fix, if you're using Azure Functions 2, make sure you avoid using Entity Framework Core 2.2.0. Downgrade your EFCore nuget package to Microsoft.EntityFrameworkCore 2.1.4. I'm guessing the issue is resolved by the time 2.2.1 is released.